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@Minh glans inganni @frn t SAMUEL O. HOTOHK-ISS, OF SYLVANIA, OHIO.

v Letters Patent No. 66,962, fitted July 2.3, 1867.

IMPROVED LIME-KILN.

llge Srlgrhnlc nient in ir. ilgcsr trtta's Q2-unit nah milling aan nf ilge snm.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, SAMUEL C. HOTCHKISS, of Sylvania, in the county of Lucas, and State of Ohio, have invented a new and useful Improvement in Iiirnc-Kilns; and I do hereby declare the following to be a full and correct description of the same, sutlcient to enable othersv skilled in the art to whichmy invention appertains to understand and use'the same, reference being had to the accompanying drawings, which make part of thisspecication, and in which- Figures I and 2 are front and rear elevations of my improved lime-kiln.

Figure 3 is a vertical section of the same, in the'line x, lig. 4; and

Figure 4 is a horizontal section of the same, in line y y, figs. I and 3.

'lhe nature of my invention consists in forming draught passages from the {ire-places to the inner sides of the kiln, so that the lire may reach the lime on all sides, said passages not connecting with the outer air, and having an upward inclinationl Also, in forming a draught passage at the bottom of my kiln in such a manner that a draught of cold air may be led through the hot, burnt lime, which air, in its passage through the same, will g'et heated, and, by carrying this heat upward to the stone that is burning, will hclp to create a draught through .the middle of the kiln, and bring the greater heat to that part of the stone.

A, in the drawings, may represent a kiln, provided with two 'fire-places B and C, which consist of the common horizontal grates b and c,`with ash-spaces below, and the vertical gratos d and e on the inside of the kiln, which latter has the shape of a truncated cone, its widest part being where the gratos are, and graduallydiminishing vin size upwards. The-bottom is spherical, with a narrow vertical outlet, a, from which a draught passage,f, leads to the opening D, at which the burnt lime is taken out, the passage fbeing provided with a door, f. From the fire-places B C lead draught'passages g g h h, to the vertical grates z' on the inner surface of the kiln, said passages inclining upwardly towards the rgratos E is an opening through which the stones are thrown into the kiln, and is provided with a door, e. The kiln is filled with limestone to its capacity, care being tak-en, as is'usual, to place the larger stones in the `middle and the smallerones around them, so as to prevent theirjamming as they fall down. The door e is then closed, and the fires kindled in the tire-places and C. After a suicient quantity of lime has been burnt, the stones below the fire which are not burnt are withdrawn through the opening D, when the burnt lime vfallsito the bottom, and the stones above which have notyet been burnt take its place at the fire, and the kiln isfilled again. The upwardly-inclined passages g and h create a draught which draws the fire through the same to the gratos 2', so that thestone is subjected to the flames on all sides. Were the passages g h horizontal, but a very poor draught would be created, but their upward inclination creates a powerful one; and if these passages -werc connected with the outer air, a current of cold air would be forced on the flames, which would take away a great deal of the heat saved by my improvement and would deadenthe tires inthe fire-places. It is well known that the stones inthe centre of the kiln are the hardest to burn, as the llames have a tendency to burn on the sides of the same and consume the smaller stones. To obviate this, I create a central draughtthrough the passagef and outlet a, which ascending through the burnt lime, which is still at a whit-c heat, and in cooling the same, carries the heat in a powerful blast directly upvthe centre of the kiln, drawing at the Isame time Vthe flames fromvthe grates d, c, and t' towards the centre, and thus burn the limestones equally in the centre and on the sides. The draught through the passage f is regulated by the door f. The dre-places or arches and the ash-places are provided with doors, the former of which have holes, so that the door may be closed and still a draught kept up.

Having thusdescribed my invention, what I claim as new, and desire to secure by Letters Patent, is

.y 1. In a limelkiln, the upwardly-inclining draught passages g g L L, substantially as and for the purposes described.

3. The combination of the upwardly-incllining passages g y k h with the outlet a and draught passage f, substantially as for the purposes described.

s. c. HoTcHKIss. Witnesses:

J. SCOTT PATTERSON,

Moons. 

